@Reasonableques3 @j_g_allen @olgakhazan I don't think they 'solved' anything in 2020 either. Just a contributor to overall suppression. Not enough on its own most places, if at all (probably nowhere).
@合理问题3@j_g_allen@olgakhazan我认为他们也没有在2020年“解决”任何问题。只是整体抑制的一个因素。在大多数地方,如果有的话(可能没有)就不够了。